#define _CRT_SECURE_NO_WARNINGS 1
class Solution {
public:
    string reverseStr(string s, int k)
    {
        int len = s.size();
        for (int start = 0; start < len; start += 2 * k)
            int i = start;
        int j = std::min(start + k - 1, len - 1);
        while (i < j)
            std::swap(s[i++], s[j--]);
    }
    return s;
}
};
````````